Low Complexity Soft Decoding with Superposition of Hard Decision Vectors in Lattice Reduction-Aided Linear Receivers

Satoshi Denno, Koki Kashihara, Yafei Hou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposes a novel approach to low complexity soft input decoding for lattice reduction-aided MIMO receivers. The proposed approach feeds a soft input decoder with soft signals made from hard decision signals generated by using a lattice reduction-aided linear detector. The soft signal is a weighted-sum of some candidate vectors that are near by the hard decision signal coming out from the lattice reduction-aided linear detector. This paper proposes a technique to adjust the weight adapt to the channel for the higher transmission performance. The transmission performance is evaluated in a 4 x 4 MIMO channel. When a serial interference canceller is used as the linear detector, the proposed technique achieves about 2.0 dB better transmission performance at the BER of 10-5 than the decoder fed with the hard decision signals, even though the proposed soft input decoding can be implemented with small additional complexity.

Original languageEnglish
Title of host publication2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages271-275
Number of pages5
ISBN (Electronic)9781665480536
DOIs
Publication statusPublished - 2022
Event33rd IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2022 - Virtual, Online, Japan
Duration: Sep 12 2022Sep 15 2022

Publication series

NameIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
Volume2022-September

Conference

Conference33rd IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2022
Country/TerritoryJapan
CityVirtual, Online
Period9/12/229/15/22

Keywords

  • lattice reduction
  • linear detectors
  • low computational complexity
  • Soft decision
  • Weighted sum

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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